%0 Journal Article
%A Underwood. F.
%T Some conditions for the existence of two periodic integrals of the homogeneous linear differential equation of the seoond order
%J Mathematische Zeitschrift
%D 1933
%P 195-201
%V 36
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1933__36_168396/
%F MZ_1933__36_168396